Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7a41cec8e5eab1…

MALICIOUS

PDF

102.6 KB Created: 2021-09-07 00:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24258fb4592049346ae10cae7d394ade SHA-1: 217e0763689474f38a57e19848f44932c8d5dc43 SHA-256: fc7a41cec8e5eab1cbb5de0c1ad10f18c915920733f9917775ec9db1482b934d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=scribd+json+to+pdf PDF link annotation
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fc286254000c1e7bdefc3a71f752a0fa/72624102775.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b14c0d3f73a---bukowomenupifob.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gi82gnb42ngfnsogd7p7dke470/63752117286.pdfIn PDF document text
    • http://schokofontaene.de/idata/14261284561.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tadejutujime.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/64273652986.pdfIn PDF document text
    • https://ijpdua.com/contents//files/rerase.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fd614b98---niwonago.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ca0d2a12---gotakidozeguwo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160dce01c03b4c---nuxolububapepilabekuliro.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/3855735776.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/devebumuruvisoxu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/81281742302.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/69320228624.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086c55159a0e---zopejosutovuk.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/risewox.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c5f1cfa3---nonarusugarakigex.pdfIn PDF document text
    • http://sartor.ru/upload/files/veradokojipamit.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kedepepofiluxofibafud.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210803075043.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b7e7032469c335de670faba3d1e01bd/9856095302.pdfIn PDF document text
    • http://novafish.it/userfiles/files/82597537349.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8ee431c8---futisapotise.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7806df69932e778a04083e9e404ebe13/37309655872.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • http://mega.kz/media/upload/files/zugenexizirulifudekosor.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a9a824e5---kukorusunamoribopi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 19976 bytes
SHA-256: 9de3374e0fd7eb78fe43dd62306bf72037deb2d12f2c37e49a9dad0dd6c051c7
font_01_sfnt_off00016252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16252 10616 bytes
SHA-256: 7ea409244eb47f3599353c0785ae7e2fdd3b5b6933718f88e1737cb51fecdfcb
font_02_sfnt_off00017a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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